package com.gisuni.sddc.model;

import java.io.ByteArrayOutputStream;

public class Base64Encoder {
	private static char[] a = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
			'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
			'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
			'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
			'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8',
			'9', '+', '/' };
	private static byte[] b = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
			-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
			-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1,
			-1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1,
			-1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
			17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27,
			28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,
			45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };

	public static String encode(byte[] paramArrayOfByte) {
		StringBuffer localStringBuffer = new StringBuffer();
		int i = paramArrayOfByte.length;
		int j = 0;
		while (j < i) {
			int k = paramArrayOfByte[(j++)] & 0xFF;
			if (j == i) {
				localStringBuffer.append(a[(k >>> 2)]);
				localStringBuffer.append(a[((k & 0x3) << 4)]);
				localStringBuffer.append("==");
				break;
			}
			int m = paramArrayOfByte[(j++)] & 0xFF;
			if (j == i) {
				localStringBuffer.append(a[(k >>> 2)]);
				localStringBuffer
						.append(a[((k & 0x3) << 4 | (m & 0xF0) >>> 4)]);
				localStringBuffer.append(a[((m & 0xF) << 2)]);
				localStringBuffer.append("=");
				break;
			}
			int n = paramArrayOfByte[(j++)] & 0xFF;
			localStringBuffer.append(a[(k >>> 2)]);
			localStringBuffer.append(a[((k & 0x3) << 4 | (m & 0xF0) >>> 4)]);
			localStringBuffer.append(a[((m & 0xF) << 2 | (n & 0xC0) >>> 6)]);
			localStringBuffer.append(a[(n & 0x3F)]);
		}
		return localStringBuffer.toString();
	}

	public static byte[] decode(String paramString) {
		byte[] arrayOfByte = paramString.getBytes();
		int i = arrayOfByte.length;
		ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream(
				i);
		int j = 0;
		while (j < i) {
			int k;
			do
				k = b[arrayOfByte[(j++)]];
			while ((j < i) && (k == -1));
			if (k == -1)
				break;
			int m;
			do
				m = b[arrayOfByte[(j++)]];
			while ((j < i) && (m == -1));
			if (m == -1)
				break;
			localByteArrayOutputStream.write(k << 2 | (m & 0x30) >>> 4);
			int n;
			do {
				n = arrayOfByte[(j++)];
				if (n == 61)
					return localByteArrayOutputStream.toByteArray();
				n = b[n];
			} while ((j < i) && (n == -1));
			if (n == -1)
				break;
			localByteArrayOutputStream.write((m & 0xF) << 4 | (n & 0x3C) >>> 2);
			int i1;
			do {
				i1 = arrayOfByte[(j++)];
				if (i1 == 61)
					return localByteArrayOutputStream.toByteArray();
				i1 = b[i1];
			} while ((j < i) && (i1 == -1));
			if (i1 == -1)
				break;
			localByteArrayOutputStream.write((n & 0x3) << 6 | i1);
		}
		return localByteArrayOutputStream.toByteArray();
	}
}